#include <stdio.h>
char c;
long cuv=1,l,q;
int main()
{
    FILE*f1,*f2;
    f1=fopen("text.in","r");
    f2=fopen("text.out","w");
    while(!feof(f1))
    {
        fscanf(f1,"%c",&c);
        if(!feof(f1))
        {
            if(c=='-')if(q!=0)cuv++;
            if(c==' ')if(q!=2)cuv++;
            if(c>='a'&&c<='z')l++;
            if(c>='A'&&c<='Z')l++;
            if(c=='.')cuv++;
        }
    }
    fprintf(f2,"%d",l/cuv);
    return 0;
}